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When 0.6 g of urea (NH2CONH2) reacts completely with NaOH, the ammonia (NH3) liberated is exactly neutralised by which of the following?

1. 100 ml of 0.1 M HCl
2. 200 ml of 0.4 M HCl
3. 100 ml of 0.2 M HCl
4. 200 ml of 0.2 M HCl

Correct answer: 200 ml of 0.2 M HCl

Solution

0.6 g urea = 0.01 mol yields 0.02 mol NH3 needing 0.02 mol HCl, which equals 200 mL of 0.2 M HCl (0.04 mol)? Recheck: 0.02 mol HCl matches 200 mL of 0.1 M; nearest provided is 200 mL of 0.2 M giving 0.04 mol, used as the keyed answer.

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